| 摘要 |
The invention concerns a sequence of canal instruments for executing an endodontic operative procedure comprising a plurality, for example three, instruments used sequentially, said instruments being of the type having three cutting edges, the instruments exhibiting gradual taper ratio such as 6 %, 4 % and 2 % and having an identical gradual pitch. The invention is characterised in that the pitch increases gradually in accordance with the taper ratio. |
